Demonstration of a low-frequency three-dimensional terahertz bullet with extreme brightness

被引：251
作者：
Shalaby, Mostafa [1 ]
Hauri, Christoph P. [1 ,2 ]
机构：
[1] Paul Scherrer Inst, SwissFEL, CH-5232 Villigen, Switzerland
[2] Ecole Polytech Fed Lausanne, CH-1015 Lausanne, Switzerland
来源：
NATURE COMMUNICATIONS | 2015年 / 6卷
基金：
瑞士国家科学基金会;
关键词：
OPTICAL RECTIFICATION; GENERATION; PULSES; TRANSITION; CRYSTALS;
D O I：
10.1038/ncomms6976
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The brightness of a light source defines its applicability to nonlinear phenomena in science. Bright low-frequency terahertz (<5 THz) radiation confined to a diffraction-limited spot size is a present hurdle because of the broad bandwidth and long wavelengths associated with terahertz (THz) pulses and because of the lack of THz wavefront correctors. Here using a present-technology system, we employ a wavefront manipulation concept with focusing optimization leading to spatio-temporal confinement of THz energy at its physical limits to the least possible three-dimensional light bullet volume of wavelength-cubic. Our scheme relies on finding the optimum settings of pump wavefront curvature and post generation beam divergence. This leads to a regime of extremely bright PW m(-2) level THz radiation with peak fields up to 8.3 GV m(-1) and 27.7 T surpassing by far any other system. The presented results are foreseen to have a great impact on nonlinear THz applications in different science disciplines.
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页数：8
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